Alarm-lock



(No Model.)

J. W. PARRISH. ALARM 1.00K.

No. 417,079. Patented Dec. 10.1889.

UNITED STATES PATENT OFFICE.

JOHN Il PARRISH, OF MILTON, 'WEST VIRGINIA.

ALARM-LOCK.

SPECIFICATION forming part of Letters Patent No. 417,079, dated DecenberlO, 1889.

Application filed August 17, 1889. Serial No. 321,065. (No model.)

To all whom, it may concern:

Be it known that I, JOHN IV. PARRISH, a citizen of the United States, and a resident of Milton, in the county ot Cabell and State of Test Ifirginia, have invented certain new and useful Improvements in Alarm-Locks; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to alarm-locks, and has for its object to provide a simple, compact, and inexpensive bell adapted to be attached to any ordinary door and to be rung by the action of the ordinary mortise-latch- I accomplish this, object by the mechanism illustrated in the accompanying drawings, in which- Figure l represents a perspective view of a portion of a door tted with my invention and having aportion ot' the bell broken away to show the internal mechanism. Fig. 2 rep resentsa horizontal cross-section of the same; and Fig. 3 is a plan view ot the interior 1nechanism of the bell, thebell proper having been removed and the bell-tongue drawn back by turning the knob.

Like letters of reference denote corresponding parts in all the figures.

The letter A denotes a door litted with the usual mortise-lock and knob-latch. The latch l5 has extending from itat right angles a pin O. This pin has a screw-thread on one end, which engages a corresponding one cut inthe latch. The pin is inserted through a mortise out in the side of the door and after the latch and lock have been placed in position in the door. The pin also projects through the slot c in the disk D,fastened on the inside of the door over the latch. The portion of the pin C which rests in the slot c is rectangular in cross-section or has fiat sides, which prevents its turning or workingloose in the latch when the disk D is once fastened over it. To the disk D is attached the remaining mechanism of the bell. The end of the pin O which projects through the disk D is circular in crosssection, a shoulder d being formed on the rectangular portion in the slot c. Fulcrumed on pin C, and resting on the shoulder d, is the sliding lever-bar E, having a shoulder e, which engages the tinger F of the bell-tongue G. The nger F is rigidly attached to the belltongue G, and with it is pivoted on the post l-I, which is rigidly iiXed in the disk D.

A small washer h is placed on the post II, under the finger F, to obviate the friction which would be caused by the finger F rub bing against the disk D. The tongue Gisl held on post l-I by an ordinary pin f, inserted through the post H. The rigid post H is biurcated above the pin f, and in said bifurcation is inserted one end of a spring I,` the other end of which rests in a bifurcated post K, loosely inserted through the armi of the bell-tongue near the striking-ball g. The bifurcation of rigid post H is at such an angle as that the spring I inserted therein shall tend to throw the striking-bang forward, and the post K, turning freely on the arm of the bell-tongue, prevents all cramping and liability o'f breaking of the spring I. A third biturcated post Lis rigidly Xed near the opposite side of the disk D from the post H, and in itsbit'urcation is inserted a spring M, which bears against the lower edge of lever-bar E, keeping the shoulder e of said bar in contact with the finger F of the tongue G. A yoke N is also ixed to the disk D, and has call-bell O fastened thereto by the embossed nut P in the usual way. These parts are such as are used in the ordinary call-bell, with the exception of the yoke N being fixed on the disk D, and therefore need not be particularly described.

The operation of thismechanism is briefly stated as follows: IVhenever the latch is drawn back by turning the door-knob', it carries with it the pin C, lever-bar E, linger F, and the striking-ball g of the bell-tongue, the spring I is pressed backward,and the spring M is pressed downward, bringing the parts of the mechanism from the relative position shown in Fig. l to the relative position shown in Fig. 35. Then the door-knob is released or the latch B is allowed to return to its normal position, the tension of the spring I will throw the striking-ball g against the bell O, causing it to sound.

The normal position of the striking-ballg is not against the bell; but the bifurcation of the post Il is placed at such an angle and IOO adapted to be struck by the lever-bar, the

the tension of the spring I is such that after the ball g has struck it will fall back a very slight distance from the bell. This will prevent the bell from sounding' by any slight jar of the building or room. A

It may be found necessary in some cases to cut away a portion of the Washer lV, as shown in Fig. l, for the insertion of the disk D.

The advantages of my invention and the wide range of its application will be readily perceived. With slight. modifications and without departing from the spirit of theinvention, it may be attached to almost any door. It is simple and compact in construction and will be of equal service in offices and private residences.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United Statesl. The herein-described alarm-lock, consist'- ing ot` the latch carrying the pin, the sliding lever-bar connected to said pin, the finger tongue adapted to be moved by the linger, the spring rigidly connected at one end and at the other end connected to the said tongue, and the bell, said parts being arranged and adapted to operate substantially as described. i

2. The herein-described alarm-lock, coni sisting of the latch carrying the pin, the disk l Vhaving the 'slot to receive said pin, the leverbar connected to said pin and provided with a shoulder, the finger having its lower end free and adapted to be struck by the lever-bar, the tongue having its upper end pivoted and operated by the finger, the'spring having its upper end connected to the pivot-post of the tongue and its lower end connected to the tongue, the spring having one end rigid and its free end bearing against the lever-bar, and the yoke secured to the disk and carrying the bell, all substantially as described.

3. In an alarm-lock, the combination of the latch and lever-bar having the shoulder, the linger adapted to be operated by said bar, the tongue operated by the finger and having a bifurcated post, the spring connected at one end to the pivot-post of the tongue and at the other end at the bifurcated post on said tongue, and the bell, all arranged and operating substantially as and for the purpose described.

In testimony that I claiin the foregoing as my own I have hereunto affixed my signature in presence of two Witnesses. 

